Resin sheet for circuit boards, sheet for circuit boards and circuit board displays

Abstract

A resin sheet for circuit boards ( 2 ) obtained from a macromolecular material of the energy ray curable type and used for embedding circuit chips, which has a double bond concentration of 4.5 to 25 mmol/g before being cured by irradiation with an energy ray; a sheet for circuit boards including the resin sheet for circuit boards, one face of the resin sheet being formed on a support ( 1 ); and a circuit board for displays ( 5 ) which is obtained by embedding circuit chips ( 3 ) into a face of the resin sheet for circuit boards in the sheet for circuit boards, followed by curing the resin sheet by irradiation with an energy ray. The resin sheet for circuit boards ( 2 ) can be advantageously used for producing circuit boards having embedded circuit chips for controlling each pixel of displays, in particular, flat panel displays efficiently with excellent quality and productivity.

The invention claimed is: 
     
       1. A resin sheet for circuit boards comprising:
 a macromolecular material capable of being cured by irradiation with an energy ray, 
 wherein the macromolecular material is capable of embedding circuit chips, and 
 the macromolecular material before being cured by irradiation with an energy ray has a concentration of double bonds of 4.5 to 25 mmol/g, 
 the resin sheet being formed on a release sheet by coating a layer of a releasing agent in the release sheet with a coating fluid containing the macromolecular material to form a coating film, drying the formed coating film, and optionally removing the release sheet. 
 
     
     
       2. The resin sheet for circuit boards according to  claim 1 , wherein when cured by irradiation with an energy ray, the macromolecular material has a storage modulus E′ of 1.0×10 8  Pa or greater at 150° C. as measured in accordance with the method of Japanese Industrial Standard K7244-4. 
     
     
       3. A sheet for circuit boards comprising a support and the resin sheet for circuit boards according to  claim 1 , wherein one face of the resin sheet for circuit boards is formed on the support. 
     
     
       4. A sheet for circuit boards comprising a support and the resin sheet for circuit boards according to  claim 2 , wherein one face of the resin sheet for circuit boards is formed on the support.